Lawson criterion for ignition exceeded in an inertial fusion experiment

For more than half a century, researchers around the world have been engaged in attempts to achieve fusion ignition as a proof of principle of various fusion concepts. Following the Lawson criterion, an ignited plasma is one where the fusion heating power is high enough to overcome all the physical processes that cool the fusion plasma, creating a positive thermodynamic feedback loop with rapidly increasing temperature. In inertially confined fusion, ignition is a state where the fusion plasma can begin "burn propagation" into surrounding cold fuel, enabling the possibility of high energy gain. While "scientific breakeven" (i.e., unity target gain) has not yet been achieved (here target gain is 0.72, 1.37 MJ of fusion for 1.92 MJ of laser energy), this Letter reports the first controlled fusion experiment, using laser indirect drive, on the National Ignition Facility to produce capsule gain (here 5.8) and reach ignition by nine different formulations of the Lawson criterion

Disrespect and abuse in maternity care: individual consequences of structural violence

Disrespect and abuse of patients, especially birthing women, does occur in the health sector. This is a violation of women’s fundamental human rights and can be viewed as a consequence of women’s lives not being valued by larger social, economic and political structures. Here we demonstrate how such disrespect and abuse is enacted at an interpersonal level across the continuum of care in Tanzania. We describe how and why women’s exposure to disrespect and abuse should be seen as a symptom of structural violence. Detailed narratives were developed based on interviews and observations of 14 rural women’s interactions with health providers from their first antenatal visit until after birth. Narratives were based on observation of 25 antenatal visits, 3 births and 92 in-depth interviews with the same women. All women were exposed to non-supportive care during pregnancy and birth including psychological abuse, physical abuse, abandonment and privacy violations. Systemic gender inequality renders women excessively vulnerable to abuse, expressed as a normalisation of abuse in society. Health institutions reflect and reinforce dominant social processes and normalisation of non-supportive care is symptomatic of an institutional culture of care that has become dehumanised. Health providers may act disrespectfully because they are placed in a powerful position, holding authority over their patients. However, they are themselves also victims of continuous health system challenges and poor working conditions. Preventing disrespect and abuse during antenatal care and childbirth requires attention for structural inequalities that foster conditions that make mistreatment of vulnerable women possible